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2010.05.12 03:28

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원문 : http://www.ischo.net -- 조인상 // 시스템 엔지니어

Writer : http://www.ischo.net -- ischo // System Engineer in Replubic Of Korea

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본문 : http://www.ischo.net -- 조인상 //시스템 엔지니어

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SCSI (Small Computer System Interface)

This document describe SCSI parallel connectors.

Interface information

Bus width

Width External connector Internal connector
Narrow
(8bit)
DB25
LD50
HD50
HE50
Wide
(16bit)
2*HD50
HD68
HD68
SCA80
Wide32
(32bit)
2*HD68
2*HD68
Note: There are also serial SCSI connectors - IEEE-1394 and SAS (Serial Attached SCSI).

Adaptec decided to associate a color with each external SCSI connector, here is a list of these :
External connector Adaptec Color Code
DB 25-pin   White
HD 50-pin   Orange
HD 68-pin   Red
Note: I suppose there is also a color for Centronics 50-pin.

Bus Speed

Speed Frequency Narrow speed Wide speed
SCSI ? 5MHz 1,5 to 5 MB/s / [no wide device]
Fast SCSI 10MHz 10 MB/s 20 MB/s
Ultra SCSI 20MHz 20 MB/s 40 MB/s
Ultra2 SCSI 40MHz 40 MB/s 80 MB/s
Ultra 160/m ? 80MHz / [no narrow device] 160 MB/s
Note: "Ultra 160/m" is not a SCSI standard yet, it's Adaptec version of the upcoming Ultra3 standard.

Narrow

DB25 (Apple) Connector

Apple decided to use a DB25 connector for SCSI (narrow), but this doesn't allow twisted pairs and is not complient to SCSI standards.
Some companies like Iomega still use this connector on new devices besides they can cause many troubles on SCSI busses using faster devices such as UltraSCSI (Iomega itself doesn't recommand using more than one DB25 device, but still use it for Zip drives).
This connector should not be used anymore for new design, use HD50 instead.


Description Name Pin   Pin Name Description
Request REQ 1 14 GND Ground
Message MSG 2 15 C/D Command/-Data
Input/Output I/O 3 16 GND Ground
Reset RST 4 17 ATN Attention
Acknowledge ACK 5 18 GND Ground
Busy BSY 6 19 SEL Selection
Ground GND 7 20 DP Data parity bit
Data bit 0 D0 8 21 D1 Data bit 1
Ground GND 9 22 D2 Data bit 2
Data bit 3 D3 10 23 D4 Data bit 4
Data bit 5 D5 11 24 GND Ground
Data bit 6 D6 12 25 TermPwr Termination power
Data bit 7 D7 13  

Narrow external (LD50 & HD50)

LD50 and HD50 use the same pinout, so this table apply to both of them.

LD50 is SCSI-1 standard and is still used for many narrow (formerly called 8bit SCSI) devices. Consider using the HD50 for new designs.
HD50 is SCSI-2 standard, fully compatible with LD50, support higher frequency such as UltraSCSI and is smaller.
Description Name Pin   Pin Name Description
Twisted pair Ground GND 1 26 D0 Data bit 0
Twisted pair Ground GND 2 27 D1 Data bit 1
Twisted pair Ground GND 3 28 D2 Data bit 2
Twisted pair Ground GND 4 29 D3 Data bit 3
Twisted pair Ground GND 5 30 D4 Data bit 4
Twisted pair Ground GND 6 31 D5 Data bit 5
Twisted pair Ground GND 7 32 D6 Data bit 6
Twisted pair Ground GND 8 33 D7 Data bit 7
Twisted pair Ground GND 9 34 DP Data Parity bit
Ground GND 10 35 GND Ground
Ground GND 11 36 GND Ground
Reserved   12 37   Reserved
    13 38 TermPwr Termination Power (+5V)
Reserved   14 39   Reserved
Ground GND 15 40 GND Ground
Twisted pair Ground GND 16 41 ATN Attention
Ground GND 17 42 GND Ground
Twisted pair Ground GND 18 43 BSY Busy
Twisted pair Ground GND 19 44 ACK Acknowledge
Twisted pair Ground GND 20 45 RST Reset
Twisted pair Ground GND 21 46 MSG Message
Twisted pair Ground GND 22 47 SEL Selection
Twisted pair Ground GND 23 48 C/D Command/-Data
Twisted pair Ground GND 24 49 REQ Request
Twisted pair Ground GND 25 50 I/O Input/Output
Note: signals positions are the same as on HE50 internal narrow connector, only pin numbers are different because of the connectors differences.

Narrow internal (HE50)

Internal Narrow SCSI cable, similar to external LD50 and HD50.


Description Name Pin   Pin Name Description
Twisted pair Ground GND 1 2 D0 Data bit 0
Twisted pair Ground GND 3 4 D1 Data bit 1
Twisted pair Ground GND 5 6 D2 Data bit 2
Twisted pair Ground GND 7 8 D3 Data bit 3
Twisted pair Ground GND 9 10 D4 Data bit 4
Twisted pair Ground GND 11 12 D5 Data bit 5
Twisted pair Ground GND 13 14 D6 Data bit 6
Twisted pair Ground GND 15 16 D7 Data bit 7
Twisted pair Ground GND 17 18 DP Data Parity bit
Ground GND 19 20 GND Ground
Ground GND 21 22 GND Ground
Reserved   23 24   Reserved
    25 26 TermPwr Termination Power (+5V)
Reserved   27 28   Reserved
Ground GND 29 30 GND Ground
Twisted pair Ground GND 31 32 ATN Attention
Ground GND 33 34 GND Ground
Twisted pair Ground GND 35 36 BSY Busy
Twisted pair Ground GND 37 38 ACK Acknowledge
Twisted pair Ground GND 39 40 RST Reset
Twisted pair Ground GND 41 42 MSG Message
Twisted pair Ground GND 43 44 SEL Selection
Twisted pair Ground GND 45 46 C/D Command/-Data
Twisted pair Ground GND 47 48 REQ Request
Twisted pair Ground GND 49 50 I/O Input/Output
Note: signals positions are the same as on HD50 and LD50 connectors, only pin numbers are different because of the connectors differences.

Wide

Wide external (HD68)

This connector is used for external Wide devices.
For 8bit devices, the HD50 should be used instead.


Description Name Pin   Pin Name Description
Twisted pair Ground GND 1 35 D12 Data bit 12
Twisted pair Ground GND 2 36 D13 Data bit 13
Twisted pair Ground GND 3 37 D14 Data bit 14
Twisted pair Ground GND 4 38 D15 Data bit 15
Twisted pair Ground GND 5 39 DP1 Data Parity bit 1
Twisted pair Ground GND 6 40 D0 Data bit 0
Twisted pair Ground GND 7 41 D1 Data bit 1
Twisted pair Ground GND 8 42 D2 Data bit 2
Twisted pair Ground GND 9 43 D3 Data bit 3
Twisted pair Ground GND 10 44 D4 Data bit 4
Twisted pair Ground GND 11 45 D5 Data bit 5
Twisted pair Ground GND 12 46 D6 Data bit 6
Twisted pair Ground GND 13 47 D7 Data bit 7
Twisted pair Ground GND 14 48 DP0 Data Parity bit 0
Ground GND 15 49 GND Ground
Ground GND 16 50 GND Ground
Termination Power (+5V) TermPwr 17 51 TermPwr Termination Power (+5V)
Termination Power (+5V) TermPwr 18 52 TermPwr Termination Power (+5V)
Reserved   19 53   Reserved
Ground GND 20 54 GND Ground
Twisted pair Ground GND 21 55 ATN Attention
Ground GND 22 56 GND Ground
Twisted pair Ground GND 23 57 BSY Busy
Twisted pair Ground GND 24 58 ACK Acknowledge
Twisted pair Ground GND 25 59 RST Reset
Twisted pair Ground GND 26 60 MSG Message
Twisted pair Ground GND 27 61 SEL Selection
Twisted pair Ground GND 28 62 C/D Command/-Data
Twisted pair Ground GND 29 63 REQ Request
Twisted pair Ground GND 30 64 I/O Input/Output
Twisted pair Ground GND 31 65 D8 Data bit 8
Twisted pair Ground GND 32 66 D9 Data bit 9
Twisted pair Ground GND 33 67 D10 Data bit 10
Twisted pair Ground GND 34 68 D11 Data bit 11

Wide internal (HD68)

This connector is used for internal Wide devices, for 8bit devices, the HE50 should be used instead.


Documentation not available yet.

Wide32

Wide32 external (Dual HD68)

P
Description Name Pin   Pin Name Description
Twisted pair Ground GND 1 35 D12 Data bit 12
Twisted pair Ground GND 2 36 D13 Data bit 13
Twisted pair Ground GND 3 37 D14 Data bit 14
Twisted pair Ground GND 4 38 D15 Data bit 15
Twisted pair Ground GND 5 39 DP1 Data Parity bit 1
Twisted pair Ground GND 6 40 D0 Data bit 0
Twisted pair Ground GND 7 41 D1 Data bit 1
Twisted pair Ground GND 8 42 D2 Data bit 2
Twisted pair Ground GND 9 43 D3 Data bit 3
Twisted pair Ground GND 10 44 D4 Data bit 4
Twisted pair Ground GND 11 45 D5 Data bit 5
Twisted pair Ground GND 12 46 D6 Data bit 6
Twisted pair Ground GND 13 47 D7 Data bit 7
Twisted pair Ground GND 14 48 DP0 Data Parity bit 0
Ground GND 15 49 GND Ground
Ground GND 16 50 GND Ground
Termination Power (+5V) TermPwr 17 51 TermPwr Termination Power (+5V)
Termination Power (+5V) TermPwr 18 52 TermPwr Termination Power (+5V)
Reserved   19 53   Reserved
Ground GND 20 54 GND Ground
Twisted pair Ground GND 21 55 ATN Attention
Ground GND 22 56 GND Ground
Twisted pair Ground GND 23 57 BSY Busy
Twisted pair Ground GND 24 58 ACK Acknowledge
Twisted pair Ground GND 25 59 RST Reset
Twisted pair Ground GND 26 60 MSG Message
Twisted pair Ground GND 27 61 SEL Selection
Twisted pair Ground GND 28 62 C/D Command/-Data
Twisted pair Ground GND 29 63 REQ Request
Twisted pair Ground GND 30 64 I/O Input/Output
Twisted pair Ground GND 31 65 D8 Data bit 8
Twisted pair Ground GND 32 66 D9 Data bit 9
Twisted pair Ground GND 33 67 D10 Data bit 10
Twisted pair Ground GND 34 68 D11 Data bit 11
Q
Description Name Pin   Pin Name Description
Q cable not available yet.
Note: P connector is a standard Wide external connector.

 



 

규격
SCSI-1
SCSI-2
Ultra
Fast Wide
Ultra Wide
Ultra2
Ultra160
Ultra320
시그널
SE
SE
SE
SE
SE
LVD
LVD
LVD
커넥터
50핀
50핀
50핀
68핀
68핀
68핀
68핀
68핀
연결수
7개
7개
7개
15개
15개
15개
15개
15개
케이블
6m
6m
3m
3m
1.5m
12m
12m
12m
버스 지원
ISA
ISA/PC
PCI
PCI
PCI
PCI
PCI
PCI/PCI X

* SCSI에서 사용하는 시그널은 SE, LVD 외에도 HVD 시그널이 있습니다.

  SCSI 컨트롤러와 주변장치간의 연결 거리가 멀 경우에 사용합니다.

  HVD는 최대 24m의 케이블 길이를 사용할 수 있습니다.

  HVD 타입은 LVD 타입이 나온 후, AHA-2944 제품만 공급되고 있습니다.

  전세계적으로 HVD 타입은 5%미만이 사용됩니다.

  HVD의 경우 UltraWide 급의 컨트롤러(AHA-2944)에서 지원하고 있으며, HVD

전용 주변장치를 연결해야 합니다.

  그렇지 않은 경우 전압의 차로 인해 장비가 손상을 입을 수 있습니다.

* 장치 연결 개수는 한채널 연결 가능한 최대 숫자입니다.

  채널이 2개 이상인 카드는 해당 채널 만큼 장치의 연결이 가능합니다.

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